code: def test_set_properties(self):
      x = ["a", "b", "c"]
      y = [1, 3, 2]
  
      mark = Bar(
          color=".8",
          alpha=0.5,
          edgecolor=".3",
          edgealpha=0.9,
          edgestyle=(2, 1),
          edgewidth=1.5,
      )
  
      p = Plot(x, y).add(mark).plot()
      ax = p._figure.axes[0]
      for bar in ax.patches:
          assert bar.get_facecolor() == to_rgba(mark.color, mark.alpha)
          assert bar.get_edgecolor() == to_rgba(
              mark.edgecolor, mark.edgealpha
          )
          # See comments in plotting method for why we need these adjustments
          assert bar.get_linewidth() == mark.edgewidth * 2
          expected_dashes = (
              mark.edgestyle[0] / 2,
              mark.edgestyle[1] / 2,
          )
          assert bar.get_linestyle() == (0, expected_dashes)
  
imports: import numpy
  import pandas
  from matplotlib.colors import to_rgba, to_rgba_array
  import pytest
  from numpy.testing import assert_array_equal
  from seaborn._core.plot import Plot
  from seaborn._marks.bar import Bar, Bars
label_desc: Use image node_id 7 for calling the TestBar obj's underlying member method code with example usage: obj.test_set_properties() without return types